[PATCH] dm: support ioctls on mapped devices
authorMilan Broz <mbroz@redhat.com>
Tue, 3 Oct 2006 08:15:15 +0000 (01:15 -0700)
committerLinus Torvalds <torvalds@g5.osdl.org>
Tue, 3 Oct 2006 15:04:13 +0000 (08:04 -0700)
commitaa129a2247b164173d45da8ad43cca5de9211403
tree8adecb4d15d49b0a1fd4b459a24dff22a961d71c
parent70abac6e4f4bfb05a8198e22225f9e066239c7a2
[PATCH] dm: support ioctls on mapped devices

Extend the core device-mapper infrastructure to accept arbitrary ioctls on a
mapped device provided that it has exactly one target and it is capable of
supporting ioctls.

[We can't use unlocked_ioctl because we need 'inode': 'file' might be NULL.
Is it worth changing this?]

Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

Arnd Bergmann <arnd@arndb.de> wrote:

> Am Wednesday 21 June 2006 21:31 schrieb Alasdair G Kergon:
> > static struct block_device_operations dm_blk_dops = {
> > .open = dm_blk_open,
> > .release = dm_blk_close,
> > +.ioctl = dm_blk_ioctl,
> > .getgeo = dm_blk_getgeo,
> > .owner = THIS_MODULE
>
> I guess this also needs a ->compat_ioctl method, otherwise it won't
> work for ioctl numbers that have a compat_ioctl implementation in the
> low-level device driver.

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
drivers/md/dm.c
include/linux/device-mapper.h
include/linux/dm-ioctl.h